This is a post where I basically get to go, “What he said!” Brian Clark,, at Copyblogger, produced a great illustrated chart that covers several spelling and grammar errors that can make one’s writing look bad. Make no mistake: if you use “your” when you really meant “you’re” (as in “you are”), it does get noticed, and it does plant a subliminal idea that you may not be as great a writer as you think. So if you’re prone to these mistakes, study the right usages till you know them — cold.